Investigation Of ZnS Based Nanomaterials By Hydrothermal Method

Currently, one of the center subjects of semiconductor materials research areas is the research of ZnS based nanocrystals. Meanwhile, the research of ZnS based nanocrystals has made remarkable progress. The method of synthesis ZnS based nanocrystals are physical methods and chemical methods. The chemical solution which is simple, cheaper, and need no expensive apparatus is popularly used. But the defect is that the reaction mechanism of chemical process is not well understood for us.Using hydrazine hydrate(N2H4·H20) as the solvent, we has synthesized uniform helical structure ZnS nanorods. The helical structured ZnS grows along the [100] direction. We has investigated the effect of reaction conditions on the phase and morphology. Meanwhile, the optical properties of the as-synthesized helical structured ZnS was characterized. This solvothermal technique could be extended to otherⅡ—Ⅵsemiconductor nanocrystals.ZnS nanoparticles was synthesized using urea as mineralizer. The average particles size is about 10nm. The results show that the process of synthesize nanoparticles of zinc sulphide using urea as mineralizer can be used in otherⅡ—Ⅵsemiconductor nanocrystals.ZnS:Cu nanoparticles were synthesized by hydrothermal process, with cubic structure and the average size of the particles is 10nm. The UV-vis optical absorption spectra show peaks centered at about 320nm. The blue shift can be attributed to the quantum confinement effect of the ZnS:Cu nanostructures. New luminescence characteristics were observed with the copper concentration from 0.5—1.5%. And the different luminescence origins were discussed.Mn-doped ZnS nanocrystals were prepared using the mixture of ethylenediamine and water as solvent. The effect of temperature and concentration of Mn was discussed. The results indicate that no obvious effect of Mn concentration on the crystal style of ZnS was observed. But the effect on the luminescence was obtained.